Chair base



This application is related to design patent application Ser. Nos. 29/305,603; 29/305,605; 29/305,606; 29/305,607; 29/305,610; 29/305,612; and 29/305,615, which are filed concurrently herewith.

FIG. 1 is a perspective view showing the front, left side, and top of a chair base which forms my new design, the broken lines of a chair and casters being for illustrative purposes only and forming no part of my design;

FIG. 2 is an enlarged perspective view thereof;

FIG. 3 is an enlarged top plan view thereof; and,

FIG. 4 is an enlarged front elevational view thereof.

The characteristic feature of the design resides in the application of parts having the appearance of an automotive disk brake and spring to the base of a chair. 

The ornamental design for a chair base, as shown and described. 